travis: npm install instead of npm ci

mcollina · mcollina · commit 5a5403291b7e · 2018-07-10T09:02:08.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,6 +3,8 @@ node_js:
   - "10"
   - "8"
   - "6"
+install:
+  - npm install
 notifications:
   email:
     on_success: never
